- Patients receiving any medications or substances that are inhibitors or inducers of CYP3A4, or CYP3A4 substrates need to be reviewed by the principal investigator. Continuation of such medications will be at the discretion of the principal investigator. Concomitant use of aprepitant or fosaprepitant is prohibited. As grapefruit and Seville oranges are known to contain moderate inhibitors of CYP3A4, these fruits or their products (including marmalade, juice, etc.) should be avoided while taking AZD1775. The use of sensitive substrates of CYP3A4, such as atorvastatin, simvastatin and lovastatin, is also prohibited in this study. Herbal preparations are not allowed throughout the study. These herbal medications include but are not limited to: St. John's wort, kava, ephedra (mahung), gingko biloba, dehydroepiandrosterone (DHEA), yohimbe, saw palmetto and ginseng.